enabling DMA on hard drives

[Peter L. Peres]

On Wed, 19 Jan 2005, Lennart Sorensen wrote:

> When asked to the kernel tends to do a good job, but you can build
> kernels that don't default to turning on DMA.

Thanks for the reality check ;-)

I thought all kernels are built without DMA tuning built in in case a 
disk is changed and wnats a DMA mode lower than atoselected. If that 
happens, there will be trouble. In all systems I have seen so far the 
dma was turned on by a script run at boot time. If you are aware of 
kernel tuning parameters that allow the kernel itself to turn on DMA 
(why would one want that ?), please share them.

thanks,
Peter
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